EP 1316563 A1 20030604 - Cellulose ethers having delayed dissolution and a process for their production
Title (en)
Cellulose ethers having delayed dissolution and a process for their production
Title (de)
Lösungsverzögerte Celluloseether und ein Verfahren zu ihrer Herstellung
Title (fr)
Ethers de cellulose présentant une dissolution retardée et un procédé pour les produire
Publication
Application
Priority
DE 10158488 A 20011128
Abstract (en)
A process for retardation of water soluble cellulose ethers includes the steps: (a) treatment of moist cellulose ethers with a dialdehyde solution; and (b) drying and comminution of the cellulose ether, with simultaneous addition of an aqueous salt solution to the cellulose ether addition of this together with dissolution of the dialdehyde, with adjustment of the pH of the cellulose ether to 6.0-8.0. Independent claims are also included for the following: (1) retardation of a cellulose ether (CE) obtained as above after a storage time of 2 years with a 15% viscosity decrease; and (2) A retarded cellulose ether with a pH in aqueous solution of 6.0-8.0.
Abstract (de)
Beschrieben wird ein Verfahren zur Herstellung von verzögert wasserlöslichen Celluloseethern, umfassend die Schritte a) Behandlung des feuchten Celluloseethers mit einer Lösung eines Dialdehyds und b) Trocknung und Zerkleinerung des Celluloseethers, dadurch gekennzeichnet, dass gleichzeitig oder zusammen mit der Lösung des Dialdehyds eine wässrige Salzlösung zu dem Celluloseether gegeben wird, wodurch der pH-Wertes des Celluloseethers auf pH 6,0 bis 8,0 homogen eingestellt wird.
IPC 1-7
C08B 11/20; C08B 15/00; C08L 1/26; C08L 1/28; C09J 101/26; C09J 101/28
IPC 8 full level
C08B 1/00 (2006.01); C08B 11/20 (2006.01); C08B 15/00 (2006.01); C08L 1/26 (2006.01); C08L 1/28 (2006.01); C09J 101/26 (2006.01); C09J 101/28 (2006.01); C09K 23/48 (2022.01)
CPC (source: EP KR US)
C08B 11/20 (2013.01 - EP KR US); C08B 15/005 (2013.01 - EP US); C08L 1/26 (2013.01 - EP US); C08L 1/28 (2013.01 - EP US); C08L 1/284 (2013.01 - EP US); C08L 1/286 (2013.01 - EP US); C09J 101/26 (2013.01 - EP US); C09J 101/286 (2013.01 - EP US)
Citation (search report)
- [X] EP 0597364 A1 19940518 - WOLFF WALSRODE AG [DE]
- [DA] WO 9918132 A1 19990415 - HENKEL KGAA [DE]
- [A] US 2488631 A 19491122 - KUNZ WALTER B
- [DA] DE 1239672 B 19670503 - HENKEL & CIE GMBH
- [A] FR 1547665 A 19681129 - DOW CHEMICAL CO
- [A] WO 9530705 A1 19951116 - BEROL NOBEL AB [SE], et al
- [A] PATENT ABSTRACTS OF JAPAN vol. 006, no. 266 (C - 142) 25 December 1982 (1982-12-25) & DATABASE CHEMABS [online] CHEMICAL ABSTRACTS SERVICE, COLUMBO, OHIO, US; retrieved from STN Database accession no. 98:109165 & DATABASE WPI Week 198245, Derwent World Patents Index; AN 1982-95856e
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
EP 1316563 A1 20030604; EP 1316563 B1 20070207; EP 1316563 B2 20101110; AT E353341 T1 20070215; BR 0204862 A 20040615; CA 2412953 A1 20030528; CN 100376600 C 20080326; CN 1421462 A 20030604; DE 10158488 A1 20030612; DE 50209431 D1 20070322; DK 1316563 T3 20070507; DK 1316563 T4 20101213; ES 2281485 T3 20071001; ES 2281485 T5 20110318; HK 1054395 A1 20031128; HK 1054395 B 20090529; JP 2003171402 A 20030620; JP 4484426 B2 20100616; KR 100952036 B1 20100407; KR 20030043746 A 20030602; MX PA02011741 A 20050826; RU 2311425 C2 20071127; RU 2311425 C9 20081227; US 2003130500 A1 20030710; US 7012139 B2 20060314
DOCDB simple family (application)
EP 02025572 A 20021115; AT 02025572 T 20021115; BR 0204862 A 20021126; CA 2412953 A 20021125; CN 02152786 A 20021128; DE 10158488 A 20011128; DE 50209431 T 20021115; DK 02025572 T 20021115; ES 02025572 T 20021115; HK 03106743 A 20030919; JP 2002337713 A 20021121; KR 20020074193 A 20021127; MX PA02011741 A 20021127; RU 2002131904 A 20021127; US 30328202 A 20021125